Locomotive piston



April 27 1926.

W 1,582,114 0. s. ANDERSON i1" LOCOMOTIVE PISTON 1 Filed March 5, 1924 (b01165 Sflpobum Patented Apr. 27, 1926.

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Application filed March 5, 1924. "SeriaIZZN 697,112.

"T0022 whom it may concern: 7 Be it known. thatI, CHARLES S. Ammuson,

l ikeplate 6,-havingan-axial hubor sleeve 7 anda cylindrical lfiangeS. The hub 7,;atrits a citizen of the United States-residing at Minneapolis, in. the county offHennep-inand State of 'Minnesota, "have invented certain new and useful Improvements in LocomotivePistons; and I dohereby:declarejthe following-to be a full, clear, and exact-description of'thei'nvention, such as'wrull-en able others skilled in the art to which it appertains. to make and use thesame My invention provides highly important improvements in engine pistons and, more particularly,,1in the pistons used. 111 locomotires. The older or. standard types of these pistons comprise 'bodymembers, usually called spiders, bull rings applied on .the spiders, and" follower plates holding the bull rings on the spiders, the said follower: plates being secured to the spiders by machine screws or similar devices. In such arrangements, the machine screws or similar devices usedto connect the follower platesto 1 the spiders frequently become loose, allowing the follower bolts to come olf,:wit-h-a result that the cylinder heads arev tornout' orother serious and costly damage doneto thepistons and cylinders.

My invention provides an improvement in the piston elements; wherebyaccidental displacement of; the follower plates' '18 made p statically impossible and damages incident thereto are eliminated.

In the accompanying drawings, which illustrate a commercial? form of the improved piston,-lil;e characters indicate like parts tlnoughout the several views.

Referring to the drawings:

Fig. 1 is a view chiefly in horizontal axial section but with some parts in full plan showing a. piston of the locomotive type designed in accordance with my lnvention;

Fig. 2 is a view looking at the piston from the right toward the left in respect to Fi 1, some parts being sectioned and some parts being broken away; and

Fig. 3 is a fragmentary section talren through the bull ring on the line 3-3 of Fig. l.

The numeral 4: indicates the customary piston rod slightly threaded and tapered at its piston-receiving end and provided with the customary nut 5.

That element. of the piston that is usually designated as the spidercompri'ses a discextended end has an enlarged portion 7 that clears the exterior of the nut and affords a -fiatbearingsurface for the:i-nner faceof the nut. f T-hehu-b 7 and cylindrical flange-dare cast integral.withthe-plate 6 sand the latter is concentric to saidghub and -is -located i-nwardz of the-periphery of said Y plateyso that the latter has an annular: bullring-clamping flange I '6 projected radially outward of said -flange-S. "The cylindrical flange 8; for a considerable distance inward of its outeredge, is internally threadechand the hulrflplate S-and cylindricahflange 8, inward of said threads-are connected by radial reinfor'cing webs 9 cast integral therewith. The webs 9 are ,lightened by openingsfi and the cylindrical flanges between? the webs is lightened byopenings 8 The follower plate 10 is of annular 'form,

-bein =a-pproi;imately of t-he"same diameter as the follower plate 6,. and is formedon its -inner 'face with an annular boss lO -that -zilig11s with the annular flange at the-extreme {)OltlOiL of= theenlargement? of'the hub 7,

and, of course, clears the nut 5. The follower plate l ls provldedwlth-an annular externally threaded fiange ll that is screwed =1n-t( the internally threaded portion of the cylindrical" flange -8. of the follower plate 6.

Thisr fiange 11 is locatedf inward of the periphery of thefo llower plate 10, so that the latter is provided with apro'jecting; portion that affords a clamping-flange for cooperation with the clamping *flange 6 to hold the bull ring.- On its inner face, the follower plate 10 is provided with tapered radial reinforcing webs 12 cast integral therewith and with the cylindrical threaded flange 11.

The bull ring 13, at its outer portion, is formed with grooves 18 to receive piston rings, not shown. The outer portion of the bull ring 13 is the'full width of the distance between the outer surfaces of the spider plate 6 and the follower plate 10, but it has an inner reduced portion 13 that fits closely between the clamping flanges or portions 6 and 10. As a simple means for securing the bull ring to the spider against rotary movements, I preferably employ a squareheaded dowel 14: having a reduced cylindrical stem 14 seated in arhole bored in'the cylindrical flange 8 and with its head engaged with a notch 13 formed in the inner portion of the bull ring 13.

To lock the follower plate against rotation in respect to the spider and bull ring, I have shown a lock plug 15, the body of which is externally threaded andpreferably slightly tapered and screwed into a tapered hole in the clamping flange portion of the follower plate 10, and the reduced stein-of which snugly its a hole bored in the bull ring. in practice, the spider, bull ring, and follower plate will be assembled as shown in the drawings, and the latter tightly screwed up against the cylindrical flange 8, and then the holes in the follower plate and in the bull ring will be bored and the hole in the follower plate tapped for the reception of the plug. This procedure insures the application of the lock plug in a position to positively hold the follower plate in its tightly screwed-up posit-ion.

hen the follower plate is screwed to position, as shown in Fig. 1, its inner portion, to wit: its annular boss 10, as shown, will closely engage with the large outer portion of the hub 7. Thus, the follower plate, when in position, is firmly supported both at its outer and inner portions, against the spider and, hence, cannot be flexed by high steam pressure.

A piston designed as described may be not only made at comparatively small cost, but may be made much lighter than the older forms of pistons, and its parts, assembled and locked together as described, cannot become accidentally loosened or separated. This not only eliminates accidents due to separation of the piston elements with the resulting large costs of repair and disablement of a locomotive, but provides a piston that will wear longer than the older form of piston and that will produce less wear on the cylinder.

What I claim is:

1. A piston comprising a spider having an axial sleeve-like. hub and a cylindrical flange located inward of its periphery and concentrically surrounding said hub, an annular follower having a cylindrical flange located inward of its periphery and having threaded engagement with the interior of the cylin rical flange of said spider, a. bull ring surrounding the cylindrical flange of said spider and clamped between those portions of the spider and follower that project rarially outward of their respective cylindrical flanges, said hub having an enlarged pening adapted to clear the exterior of a nut, and said follower having an axial opening that registers with the enlarged openof said hub and is also adapted to clear the exterior of a nut, said follower being clamped directly against the adjacent flat surfaces of the hub and cylindrical flange of said spider.

2. A piston comprising a spider having an axial sleeve-like hub and a cylindrical flange located inward of its periphery and concentrically surrounding the hub, and an annular follower having a cylindrical flange located inward of its periphery and having threaded engagement with the cylindrical flange of said spider, and a bull ring sur rounding the cylindrical flange of said spider and clamped between those portions of the spider and follower plate that project radially outward of their respective cylindrical flanges, the body of said spider beg in the form of a disc-like plate, and the eve-like hub and cylindrical flange of said spider being of substantially the same axial drrnensions, said hub having an enlarged extended end adapted to clear the exterior of a nut and to afford a flat clamping surface for the inner face of a nut, and said follower having an opening with an annular boss that registers with the large flange at the end of said sleeve.

In testimony whereof I allix my signature.

CHARLES S. ANDERSON. 

